Hypotension was defined as a systolic arterial pressure < 90 mmHg or a decrease more than 30% of the baseline value, and it was treated with 5 mg IV Ephedrine (Efedrin, Osel, Istanbul, Turkey) (8). Determining 40% or higher decrease in the above-mentioned values, the dose of remifentanil infusion was decreased by 50% in addition to administration of 5 mg IV Ephedrine; in case no improvement was observed and systolic arterial pressure remained below 40% of the baseline value, the dose of remifentanil was decreased by 1/4. A heart rate < 50/min was defined as bradycardia and treated with 0.5 mg IV Atropine.